...... mostly harmlessStaff

From their FAQ

When I compressing or converting some movies, I don't get any sound or I get an "error opening audio file" message - what's up?

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Answer

The RAD Video Tools uses QuickTime to import compressed sound formats. Make sure you have the latest version of QuickTime from www.apple.com installed with all of the optional components. Since almost all computers have QuickTime installed, this usually means that the optional components are missing. To fix this, redownload QuickTime and choose "custom" installation - then mark all of the optional components and wait for everything to be downloaded and installed.

...... mostly harmlessStaff

It is saying that The RAD Video tools needs Apple Quicktime to enable it to encode the audio in your avi. If you do not have the Quicktime codecs (coder/decoder) installed, you will not have sound in your videos.

...... mostly harmlessStaff

No guarantee that it will work, I am only going by the suggestion in the FAQ.

Personally I do not have any problems with the RAD tools, I just did a quick test and everything was fine, and I do not use Quicktime. I have never liked it, because years ago it used to get in the way, annoy you, take over everything and become the default player etc.

I also rarely ever use bink video, but I do quite a bit of other video work, so have lots of different codecs installed, which maybe the reason that I don't need Quicktime.